node_composite_normalize.c

Go to the documentation of this file.

/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. 
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2006 Blender Foundation.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s):  gsr b3d, and a very minor edit from Robert Holcomb 
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "node_composite_util.h"


/* **************** NORMALIZE single channel, useful for Z buffer ******************** */
static bNodeSocketTemplate cmp_node_normalize_in[]= {
    {   SOCK_FLOAT, 1, "Value",         1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f, PROP_NONE},
    {   -1, 0, ""   }
};
static bNodeSocketTemplate cmp_node_normalize_out[]= {
    {   SOCK_FLOAT, 0, "Value"},
    {   -1, 0, ""   }
};

static void do_normalize(bNode *UNUSED(node), float *out, float *src, float *min, float *mult)
{
    float res;
    res = (src[0] - min[0]) * mult[0];
    if (res > 1.0f) {
        out[0] = 1.0f;
    }
    else if (res < 0.0f) {
        out[0] = 0.0f;
    }
    else {
        out[0] = res;
    }
}

/* The code below assumes all data is inside range +- this, and that input buffer is single channel */
#define BLENDER_ZMAX 10000.0f

static void node_composit_exec_normalize(void *UNUSED(data), bNode *node, bNodeStack **in, bNodeStack **out)
{
    /* stack order in: valbuf */
    /* stack order out: valbuf */
    if(out[0]->hasoutput==0) return;

    /* Input has no image buffer? Then pass the value */
    if(in[0]->data==NULL) {
        copy_v4_v4(out[0]->vec, in[0]->vec);
    }
    else {
        float min = 1.0f+BLENDER_ZMAX;
        float max = -1.0f-BLENDER_ZMAX;
        float mult = 1.0f;
        float *val;
        /* make output size of input image */
        CompBuf *cbuf= in[0]->data;
        int tot= cbuf->x*cbuf->y;
        CompBuf *stackbuf= alloc_compbuf(cbuf->x, cbuf->y, CB_VAL, 1); /* allocs */

        for (val = cbuf->rect; tot; tot--, val++) {
            if ((*val > max) && (*val <= BLENDER_ZMAX)) {
                max = *val;
            }
            if ((*val < min) && (*val >= -BLENDER_ZMAX)) {
                min = *val;
            }
        }
        /* In the rare case of flat buffer, which would cause a divide by 0, just pass the input to the output */
        if ((max-min) != 0.0f) {
            mult = 1.0f/(max-min);
            composit3_pixel_processor(node, stackbuf, in[0]->data, in[0]->vec, NULL, &min, NULL, &mult, do_normalize, CB_VAL, CB_VAL, CB_VAL);
        } else {
            memcpy(stackbuf->rect, cbuf->rect, sizeof(float) * cbuf->x * cbuf->y);
        }

        out[0]->data= stackbuf;
    }
}

void register_node_type_cmp_normalize(bNodeTreeType *ttype)
{
    static bNodeType ntype;
    
    node_type_base(ttype, &ntype, CMP_NODE_NORMALIZE, "Normalize", NODE_CLASS_OP_VECTOR, NODE_OPTIONS);
    node_type_socket_templates(&ntype, cmp_node_normalize_in, cmp_node_normalize_out);
    node_type_size(&ntype, 100, 60, 150);
    node_type_exec(&ntype, node_composit_exec_normalize);
    
    nodeRegisterType(ttype, &ntype);
}